package com.myview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.widget.GridView;

import com.xiaochun.hxhj.R;

/**
 * Created by 0.0 on 2018/5/7.
 */

public class MyGraidView extends GridView {

    private Paint paint;

    public MyGraidView(Context context) {
        super(context);
    }

    public MyGraidView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyGraidView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initPaint();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
        initPaint();
    }
    private void initPaint() {
        paint = new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(10);//设置画笔宽度
        paint.setColor(getContext().getResources().getColor(R.color.colorFFAE04));
    }

    /*@Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        View localView1 = getChildAt(0);
        int column = getWidth() / localView1.getWidth();//列数
        int childCount = getChildCount();
        Paint localPaint;
        localPaint = new Paint();
        localPaint.setStrokeWidth(10);//设置画笔宽度
        localPaint.setStyle(Paint.Style.STROKE);
        localPaint.setColor(getContext().getResources().getColor(R.color.colorFFAE04));//这个就是设置分割线的颜色
        for (int i = 0; i < childCount; i++) {
            View cellView = getChildAt(i);
            if ((i + 1) % column == 0) {//每一行最后一个
                canvas.drawLine(cellView.getLeft(), cellView.getBottom() , cellView.getRight(), cellView.getBottom(), localPaint);

            } else if ((i + 1) > (childCount - (childCount % column))) {//最后一行的item
                canvas.drawLine(cellView.getRight(), cellView.getTop() , cellView.getRight(), cellView.getBottom()-20 , localPaint);

            } else {
                canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom() - 0, localPaint);
                canvas.drawLine(cellView.getLeft(), cellView.getBottom() , cellView.getRight(), cellView.getBottom() , localPaint);
            }
        }
    }*/

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);

        //子view的总数
        int childTotalCount = getChildCount();
        //列数
        int columnCount = getNumColumns();
        //行数
        int rowCount;
        if (childTotalCount % columnCount == 0) {
            rowCount = childTotalCount / columnCount;
        } else {
            rowCount = (childTotalCount / columnCount) + 1; //当余数不为0时，要把结果加上1
        }

        for (int i = 0; i < childTotalCount; i++) {//遍历子view
            View cellView = getChildAt(i);//获取子view
            int height = cellView.getHeight();//子view的高度

            if (!(i % columnCount == 0)) {//不是第一列
                canvas.drawLine(cellView.getLeft(), cellView.getTop() ,
                        cellView.getLeft(), cellView.getBottom() , paint);
            }

            if (!(i >= (rowCount - 1) * columnCount)) {//不是最后一行的第一个及其他
                canvas.drawLine(cellView.getLeft(), cellView.getBottom(),
                        cellView.getRight(), cellView.getBottom(), paint);
            }
        }
    }
}